<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul {
            width: 200px;

            margin: 100px auto;
        }

        ul li {
            list-style-type: none;
            float: left;
            width: 24px;
            height: 24px;
            margin: 10px;
            background: url(images/jing.png) no-repeat;
        }
    </style>
</head>

<body>

    <ul>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
    <script>
        var lis = document.querySelectorAll('li');
        for (let i = 0; i < lis.length; i++) {
            var index = i * 44
            lis[i].style.backgroundPosition = '0 -' + index + 'px';
        }
    </script>
</body>

</html>